Caliper-compass tool.



B. A. BURNS.

CALIPER COMPASS TOOL.

APPLICATlON FILED APR. 27. 1915.

Patented Dec. 7, 1915.

COLUMBIA PLANOBRAPH 4:0..WA5HINOTON, D. c.

BENJAMIN a. nun

s, or steam, NEwI-mnsnY.

i jcALIPnn-ccraimss rooL.

pe fi fi i i Patented neaaiaia.

Application filed April 27,1915. Serial No. 24,266.

' To all whom it may concern. I

Be it known that I, BENJAMIN A. Bonus, a Citizen of the United States residing at Hoboken, county of Hudson, and State of New Jersey, have invented a new and useful Caliper-Compass Tool, ofwhich the' following is a specification.

My lnventlon relates to-lmprovements 1n draftsmans and artlsans dlvider, callpers and compasses which I will name in my specifications caliper-compass, in which the controlling mechanism for setting in any desired position is obtained by the peculiar construction of the axis head, operating with a pivot and set-screw, with arms for dividers or calipers, or, with extension legs in conjunction with elbows with attached points, and the objectsof my improvements are, first, to provide facilities to confine within the circumference of, or, extension from the axis head, an independent fixing device apart from a possibletoo freely worn pivot, assuring complete control in the setting of the arms in every position of their revolution; second, to provide facilities for aiiixing elbows having points moving outwardly and inwardly and controllable in anyposition, to secure a right angle contact outside and inside on any part of the surface of any object. I attain these objects by the mechanism illustrated in the accompanying drawing, in which Figure 1 is a plan view of the tool with arms at a horizontal alinement adjusted for flat surface compassing manipulation with the points turned at the elbow to a right angle contact. Fig. 2, is a plan'view of the tool with caliper blades adjusted. Fig. 3, is a plan view of the outside of one arm ofthe tool showing the grooves for receiving the points outwardly with one point closed and one point open. 7 Fig. l, is an enlarged vertical view of the head of the caliper-compass on line 1-2, Fig. 5. Fig. 5, is a front plan view of the tool with points inclosed with dotted lines showing one position of the tool as inside calipers withthe'points outhereinafter. with pivots GG, and set-screws H,-H,

3, on line 7'--8, with outside and inside grooves for points.

With three points closed and one open the tool is available for a marking point, as atFig. 3.

' The plan view at Fig. 1, shows the beveled disk- A, the shoulders of the arms BB, the pivot C and-theset-screw D. The rigidity obtained by the set-screw supplemented by the construction of the two parts'of the head playing into andsteadiedby the projecting shoulders of the arms will be referred to The cylinder elbows FF,

with the points EE turned to right angles places the tool in a direct and convenient position for flat surface manipulation with a right angle contact, obviating all danger of slipping, and consequently, securing a firm line with any point in use.

The outside view of the arm at Fig. 3, shows outward grooves cut out of the arm for the reception of the'points when not in use with one point open and one closed in a similar way as a pen-knife blade is received. The grooves are preferable but not necessary, as without them the points fall well out of the way when not in use.

At P-P, deep crescent recesses on the outer. sides of the grooves show how the operation of opening the blades or points may be accomplished by the thumb nail, as with a jack-knife. At the elbows a recess is cut through the arm end, corresponding to the circular form of the cylinders, for the reception of the cylinders with points attached, which will be referred to hereinafter.

A vertical view of the axis head of the tool previously referred to is shown at Fig. 4, on line 12, Fig. 5, with dotted lines showing one side of the axis head with one shoulder. The two parts of the secured axis head on a pivot i,". are beveledat an acute angle as at m, with each side of the beveled heads fitting into corresponding projections at the opposite shoulders of the arms as at j-lc. The bevel with adjusted recesses at the shoulders is preferable to rectangular recesses with receiving projections.

A set-screw Z in passing through one side'of the axis head, first contacts with the opposite side of the axis head, which in turn bears against the projections y'lc at the shoulders, which resists theshock with the head rigidly set. The shoulders resistance, therefore, prevents strain on the pivot i and holds the leg points, or, the elbow points at aftrue alinement; 1 The dotted lines leading from y'70 show one shoulder, with one side of theiaiiis-head separately. 7

An enlarged Vertical sectional View ofthe elbow at Fig. 8 previously referred to shows the two cylinders Q,Q,, with spool projections on a pivot R. The ribs of the 7 arms having corresponding recesses, as at v 0-0 for the reception of the cylinder: 10

s 001 projections. The set-screws each cylinder Q,Q, separately by -contacting first with the near cylinder which inturn contacts by means of the spool projectionswlth the recess in the rib of the arm, restraining the pressure against the other cylinder andthe pivot. The points attached to the cylinders are adjustable (iopies t'lf this patent may be obtained for sired, 7 y w v=I am aware that priorto my. invention tools have been made, folding inwardly bination broadly but I" claim A pair of caliper legs, each leg having a v beveled disk head integral therewith and a shoulder. undercut to engage the beveled either outwardly or and set as dei only "I thereforeJdonot claim'such acornpart of the disk on the-other leg, means for was ii stqi 9-" five cents .each, by addressing the G nlinissioner of Patents, 

